Greetings,
I am new to the arduino and electronics. I need some help for the power supply. I need to power a Uno r3, a l293d motor shield, two 3v dc motors (going to get better ones eventually)
To the best of my knowledge, I am aware of these options. 6 AA battery pack will provide enough currents since the motor needs at least 2000mAh. Or a LiPo battary 2 cell at 7.4v at 2200mAh . I am leaning towards the LiPo since the 6AA battery is very bulky. My design is very compact, and I hope to keep it that way.
Would a single 7.4 LiPo be sufficient to power everything from the arduino's 2.1mm jack? Aside from charger, would I need any other peripherals for a LiPo since they can get complicated? Are there any other compact battery options that can provide enough volt and current?
Edit:
My parts are as follows:
Arduino Uno Rev3
Tamiya Twin Motors
l293D Motorshield
Ultrasonic Range Sensor
Some wires
Give a detailed description of what you are trying to do (with links). This will help us help you.
Are you wanting the battery to run for a specific minimum time? Are you going to charge the battery externally (these batteries require special charger).
Weedpharma
I'll try to provide more detail of the components that I have with links to their product descriptions. I know that DC motors require a lot of current to run and a simple 9v won't cut it once I connect the motors to the arduino.
I want the motors to run for as long as it can, meaning over 15 minutes, ideally. I did some more research on two Li-Ion 18650 Battery as a possible option for me as well. I want something to fit nicely under the arduino and the motor shield without being as bulky as 6 AA battery pack. Maybe even have a standoff for the Arduino and have something fit underneath it.
My parts are as follows:
Arduino Uno Rev3
Tamiya Twin Motors
l293D Motorshield
Ultrasonic Range Sensor
Some wires
- Might add a servo for the sensor.
Possible Battery options I've looked at, but haven't purchased:
two Li-Ion 18650 Battery -will get charger and holder
DFRobot LiPo Battery 7.4v 2200mAh -will get charger
That's all I have for now, I hope this helps. I also want to have one power supply for everything if I can, but I can settle for separate power supply to motor and arduino if I can find something compact enough.
Edit: Updated top post with links.
The Li ion batteries of capacity 2000mAh should be able to run the system easily for 15+ mins assuming the motors are not stalled.
You will need to reduce the voltage to suit the 3V motors. If you use two 18650's you can use the 7+V for the arduino and 3.7v for the motors ( a suitably rated diode could reduce the voltage to around 3V).
This would result in unevenly discharged cells but this would not be a problem if you use a charger for single cells.
L293 drivers have a large internal voltage drop so you may need to use the two cells to get sufficient V on the motors.
Weedpharma